I'm a bit confused. What does any of this have to do with the central thesis of the talk? ("Compile time hierarchies of encapsulation that match the domain mode

I'm a bit confused. What does any of this have to do with the central thesis of the talk? ("Compile time hierarchies of encapsulation that match the domain model were a mistake") I understand that OOP is a somewhat diluted term nowdays, meaning different things to different people and in different contexts/communities, but the author spent more than enough time clarifying in excruciating detail what he was talking about.